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dc.contributor.authorPujol Solà, Núria
dc.contributor.authorRomán Alpiste, Manuel J.
dc.identifier.citationPujol-Solà, N... [et al.] 2022. Cadomian metabasites of the Eastern Pyrenees revisited. Geologica Acta, 20.13, 1-26, I-IV. DOI: [10.1344/GeologicaActa2022.20.13]es_ES
dc.description.abstractThis study presents a new geochemical, petrological, and geochronological U-Pb dataset from Ediacaran metabasites and associated rocks of the Canigó and Cap de Creus massifs, Eastern Pyrenees. Metabasites are composed of calcic amphibole + plagioclase + chlorite + epidote ± quartz plus titanite + apatite + ilmenite ± biotite ± rutile as accessory phases and show relict igneous textures. Peak pressure-temperature determinations share common conditions, ranging 452-482ºC and 5.2-7.7kbar, which suggest Barrovian-type metamorphism, most likely related to a collisional setting. The metabasites correspond to evolved basaltic rocks (Mg#<0.55) with moderate TiO2 content (up to 2.08wt.%) and relatively low Cr (43-416ppm). The rocks are moderately enriched in Light Rare Earth Elements (LREE) relative to Heavy Rare Earth Elements (HREE) (average (La/Lu)n of 2.7) and the N-MORB normalized multi-element patterns show negative slopes, with prominent negative Nb anomalies ((Nb/La)NMORB=0.33–0.78). These variations are akin to island arc tholeiites generated in back-arc basins and to other metabasites described in the Eastern Pyrenees with a putative Ediacaran age, and they differ from the Ordovician tholeiitic metabasites from the Canigó massif, which derived from a contaminated E-MORB source. The positive ƐNd(T) values (0.82-3.05) of the studied metabasites preclude a notable contribution from an older continental crust. Detrital zircon U-Pb dating Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry (LA-ICP-MS) of one chlorite-rich schist sample in contact with the metabasites from the Canigó massif yielded a main peak at ca. 632Ma and apparent maximum age of deposition at ca. 550Ma. We argue that the Cadomian metabasites from the Pyrenees formed during back-arc extension in the continental margin of Gondwana and were later affected by (probably early Variscan) medium-P metamorphism before the Low-Pressure High-Temperature (LP-HT) metamorphism classically described in the Pyrenees.es_ES
dc.description.sponsorshipSpanish Government CGL2017-87631-P PGC2018-093903-B-C22es_ES
dc.description.sponsorshipMinisterio de Ciencia, Innovacion y Universidades/Agencia Estatal de Investigacion/Fondo Europeo de Desarrollo Regional, Union Europeaes_ES
dc.description.sponsorshipMargarita Salas grantes_ES
dc.description.sponsorshipUniversitat de Barcelonaes_ES
dc.description.sponsorshipMinisterio de Universidades/NextGenerationEU/PRTR/Plan de recuperacion, transformacion y resilienciaes_ES
dc.publisherUniversitat de Barcelonaes_ES
dc.rightsAtribución-CompartirIgual 4.0 Internacional*
dc.subjectInherited zircones_ES
dc.subjectIberian Massifes_ES
dc.titleCadomian metabasites of the Eastern Pyrenees revisitedes_ES

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